期刊
APPLIED SURFACE SCIENCE
卷 442, 期 -, 页码 12-19出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.01.316
关键词
Magnesium titanate; Nanopowders; Polyacrylamide gel method; Flash sintering
类别
资金
- National Natural Science Foundation of China [51102022]
- China Postdoctoral Science Foundation [2015M582584]
- Postdoctoral Research Project of Shaanxi Province [2016BSHEDZZ06]
- Special Fund for Basic Scientific Research of Central Colleges, Chang'an University [310831171011]
- International Science & Technology Cooperation and Exchanges Plan in Shaanxi Province of China [2016KW-044]
- Special Fund for Basic Research Support Programs of Chang'an University
Using a polyacrylamide gel method, phase pure and well-dispersed MgTiO3 nanopowders were prepared at 800 degrees C for 2 h. It was found that a high mole ratio of monomers to precursors resulted in low formation temperature of MgTiO3, due to the highly mixing homogeneity and smaller particle sizes of precursors. Sintering behaviors of MgTiO3 nanopowders under DC electric field from 500 to 800 V/cm were investigated. Nearly full dense MgTiO3 ceramics can be prepared in 30 s. An abrupt and simultaneous increase in current density and power dissipation were observed in sintering process, which are characteristics of flash sintering. The power dissipation for the flash sintering was found to be 82 mW/mm(3). The densities and average grain sizes of samples increase with the increase of the electrical field strength. It was suggested that Joule heating was the main mechanism of flash sintering of MgTiO3 ceramics. Our work provides a useful route for the fabrication of dense MgTiO3 ceramics at low temperature in short time. (C) 2018 Elsevier B.V. All rights reserved.
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